Question: 4 . a ) Calculate the planar atomic density in atoms per square millimeter for the ( 1 1 1 ) plane in BCC chromium,

4. a) Calculate the planar atomic density in atoms per square millimeter for the (111) plane in BCC chromium, which has a lattice constant of \(0,28846\mathrm{~nm}\).
b) Calculate the linear atomic density in atoms per milimeter for the [111] direction in FCC iridium, which has a lattice constant of \(0,38289\mathrm{~nm}\).
4 . a ) Calculate the planar atomic density in

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